As you step onto the plane and are greeted by a flight attendant, you’re probably just thinking about finding your seat and getting your luggage stored away.
But that flight attendant saying hello? Well, they’re checking you out.
It’s not about appreciating your appearance, however. The cabin crew members are trained to notice things about you and make an assessment.
In a split second they decide whether you would be a help or hindrance should an emergency arise.
Experienced flight attendant Sjaak Schulteis tells The Sun the first thing on-air staff figure out is what language you speak, judging by what's in your hand.
"We pay attention to their language and check if they hold a magazine or newspaper," Schulteis says, adding that flight attendants might try to greet passengers in their native tongue.
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There's a safety aspect to that detail, though, fellow flight attendant Janice Bridger adds.
"If a person cannot understand English, they cannot understand shouted commands, nor can they read the instructions on how to open the exits," she explains.
"That may disqualify someone from sitting in the exit row."